Electric signaling system



. Feb. 4, 1930. H, cH 1,745,981

ELECTRI C S IGNALING SYSTEM Filed Dec. 15, 1924 Ezyj I INVENTOR HENRI CHIREIX TTORNEY Patented F b. 4,1930

'nnnnr cHIREIx. or PARIS, rnANcE UNI-TED STATES};

PA ENT;oFEIcE ELECTRIC SIGNALING sYs'rmvL I Application filed December 15, 1924, Serial 'No.-75 5,843, andfi'n France January 3, 1924.

My invention relates to improvements in electrical signaling systems and methods. Moreispecifically my-invention relates tov multiple-transmission of radio signals. One of theprincipal objects of my invention is the provision. of a plurality of radi I ating antennae energized by a smaller num:-' ber of. main Talternators than there are an tennae resulting inithe following advantages: .;(1) low ,no-loadlosses; (2) :lowinstallation cost ('3) low operating costs; '(4) flexibility in the application 'of'power to any one ormore-of said antennae. j Other objects and advantages of my inven- 15 ;tion will be apparent from the following description'taken in conjunction with the accompanying drawing 'in which Fig.1 is a schemati diagram of'a preferred radio transmittingsystem.

Fig. 1 is a detailed construction of the power regulating means in Fig. 1, and I Fig. 2 is a schematic diagram of a preferred type of mainalternator.' Referring to Fig. 1, a main alternator. 10f -frequency F is connected to the distributing bus bars 4,4. The alternator is suitably compounded. by a, condenser 2 connected I therewith;- An iron core inductance coil 3* is connected, across the condenser for-per-. BQ-mitting thepassage of currents of themodulating frequency as, will be morecompletely explained later. @The busbars 4, 4, sqpply y a plurality of transmittingid'evices andOu 1 I The transmitting-device ,A' comprises an antenna '5, atuningcoil 6,1a coil 7 and the" secondary-coil of a couplingdevice 8-all con-2' nected in series and grounded'at G as shown.

The transmitting device A further comprises:

q a coil 9 and the primary coilofthcouplingdevice 8 both connected in series across the J" bus bars 4. 4' by leadsfi; and 5, the bus bar; 4 being grounded at G ias shown. [The -i1n:.- pedancesv of the 'coils .7 and. 9 are I simulta 'c *11e0usly'regulatedby the common control device 10 in the mannerindicated in Fig. 1*. When the impedance of the coil 9 isvarie'd to influence the amount of energy supp'liedto. the antenna 5 the impedance of thecoil 7 is simultaneously variedto preservezthetuning as set forth above in connection WlththGCOllS of the-transmitting device A to the desiredv frequency. -A keying mechanism 11 is schematically shown for energizing and de v energizing'the antenna 5. a The transmitting device B comprises an antenna12, a tuning coil 13, acoil 14, the sec-' ondary coil of a first coupling device 15-and the secondary coil of a second couplingdevice 15 all connected in series and grounded at G as shown.

A loop circuit is connected across the and terminals of a direct current generator 16. v Starting fromthe terminalfthis circuit f. comprises a condenser 17 the primary coil of the first coupling device 15, coil 18 ofa first iron core impedance device, coil 18. of a second iron core impedance device, primary. coil of the second coupling: device 15, andcon-j denser 17 to the terminal of the generator Secondary coils of transformers 19 and 19 are connected across'condensersl7 and 17- respectively. The primary coils oftransformers19 and 19. are connected in series across the terminals of a modulating frequency generator 20 of frequency f A coil-21 is connected between bus bar 4 and the junction point of-coils18 and 18 by the lead 22. Lead22 connects the positive terminal of generator 16'tobus bar 4. The im-. pedances ofthe coils 14 and'21 are simulta-f P neously regulated by the control member 23 in the sa'memanner and for the saniereasons portion of this resistanceis arranged totbe" short circuited'by a keying device 26'.

The transmitting device 0- is similar to the; transmitting device B with the exception that: '9 its modulation generator is'-.arranged preferably to supply a different modulating frequency f from that ofthe generator .20 of device 13.. A description of the transmitting device G is therefore thought to be unneces sary.- ;x .The system above described functions "in the following manner. Antenna 5 is tuned; to the frequency F of generator land trans-w mite-on that frequency; By-manipulation of control member 10, all or a part of the power out-put of main generator 1 may be employed for transmission by the transmitting device A. Manipulation of control device 23 simi larly effects the amount of power utilized by transmitting device B.

When the keyi.ng.device126-is=- open cir= cuited thedirectcurrent generator l6 -furnishes only sufficient current to effectvveryv slight magnetization of the coresof impedances 18 and 18'. These impedance coils therefore offer large impedance to 'the pas-- sage of the main frequency and the modulating frequency; a If any alternating; current; does pass thru, the induced electromotive forces in the antennail12 will neutralizeowing to passage ofialternatingj currents in Y opposite directions thrui the coup'ling: devices 15 and Antenna 12 will therefore'ra'diatefno energy:-

Assume nowthat keyinggdvice '26 is closed to 1 short circuit. portion of." resistance 24. The electrom otitve force aeross the-"terminals of the generator :16 i-rises. i This increases the degree of magnetization of thefcoresof im-V pedances 18'r-andlSfi. T l1'B-'"COT6S are now magnetizedrto pointslightly beyond the knees I of their r respective saturation curves. The .transform'ersu19 and 119; are .so connected as to effect an additionrof the' modulating: currents flowingz inx the'zlead: 22: During a positive: half of the modulating frequency w-ave one oftheimpedancecoils sayr18 offers a largeimpedimce to the flow of=current while "the other one 18 offers practically zero imapedancer: During: a negativemhalffof the modulating ifrequency wave, impedancecoil 18- offers practically zero impedance while coil 18" offers-a large impedance; 'Theelectromotive force of themain generator is therefore shiftedtliru 180 in: the antenna 12 as the modulating-frequencywaveclianges from 'positive to negative; The antenna: 12 may be tunedtothefrequency of themain generator minus-the modulating frequency (F f or to the main generator frequency plus the modulating frequency While it is preferable :to have the modu-s lating frequencies for the antennae 12and 12? different, it. is possible'to employ the same modulating" frequency for" each. In this event one-of the antennzeis tuned to the sum of the mainrfrequency'andthe modulating frequency ('F" f While 'tlieotheri antenna is tuned to the difference between xthe :main' frequency and' the modulating:

While a1 singlespliasesystem has been 1 shown and-idescribedfor'reasons of simplicityof disclosure, ai polyphasesystem for EaCCOmsplishing the same results might be employed;- Fig. 2lisa diagrammaticshowingiofrlan frequency alternator furnishing currents F of: absolutely" constant frequency that: may: be employed in Fig-L1 'llhisialternatorbypreferenceiis two field-windings are passed by two-phase currents due to or supplied from rectified beats of the same auxiliary alternator and an auxiliary socurce regulated to a frequency very 'slightly'idiffering; from; thatiwhich" the alternator would normally; supply; (prefer;-

ably ai'valve outfit) it willib'e seen that'there will be. available satithe twoisterminalsr:0f;1the

stator a current having; ani'ab'solutely identicalfrequency to: the onei'furnishediby-saidf auxiliary sourceand therefore as: constant as that: supplied by the/said: auxiliary source-.2

/fihilea I 5 have shown and? described various/ preferred IZIOCllfiCZlillOIIS'Of 1 my invention, I

do notlimit anyself to theisa'me-but may ems ploy such other modifications as come :within the spirit and scope of my invention. i,

-Claims' 1;- In: a radio signalling'system,the com bination: of a high frequency alternatorpa plurality of radiating circuitsadapteditoibex fed: from said; alternator, means in .each of said circuits for controlling:thezamount:of;

power supplied thereto from said alternator,

and a plurality of .modulatingfimeans" asso-= ciated: with) said:.radi'ating circuits-,1 whereby different signal impulseszaimaye' beifradiated from saiddevi'cest' 2; Thecombinationwith' a'sou'rce of p'ower and'laradiating device arranged to be ener gizedi thereby, a: coil associated with said source-of:power,-a coil associated with said radiating. device and means mechanically interconnected for" simultaneously ad]ust1ng said. coils; whereby the amount of powertakentby the radiating devicema-y be varied without disturbing the :tun'ing .of saidrradiating device. 7 V

3: In: combination' al source "of liigh frequency oscillations, a palri of v bus-bars associated withasaid source;, a radiating :device 7 adapted to beifed-from said'bus-b'ars: and-to radiate. at: the frequency 1 of! said source, a

second: radiating. device adapted to r be fedfrom lsaidrbusbarsiand toradiate-at a frequenoyi substantially different from the fre- 4-; In a radio' signalingisystem; the; combinati'on'iofra main high frequency alternator, v

a=plurality 'of' radiating devices arranged 'in' pa-rallel and adapted to be-fed from'said' alternato'r; modulating mea-nsassociated with each radiating device, means associated with one of said radiating devices for transmitting the sum of the frequencies of the mam alternator and the corresponding modulating means, and means associated with the other of said radiating devices for transmitting the difference of the frequencies of the main al-' ternator and the corresponding modulating device, and means to independently vary the power output in each of said radiating devlces.

5. Ina radiosignaling system, the combination of a high frequency alternator, a pair of bus-bars associated with said alternator, a plurality of radiating devices adapted to be energized from said bus-bars, a modulating frequency generator associated with each of said radiating devices, andmeans included in each radiating device for selectively adding or subtracting the output of said alternator and the corresponding modulating generator.

a 6. Ina radio signaling system, the combination of a high frequency alternator, a pair of bus-bars associatedwith the said alternator, a-plurality of radiating devices each of which is adapted to be energized from said bus-bars, a modulating frequency generator associated With'each of said radiating devices, means included in each radiating device for selectively adding or substracting the outputs of said alternator and the corresponding modulating generator, and means for controlling the amount of energy radiated from each of said radiating devices.

7. In combination a high frequency generator, a pair of bus-bars associated therei with, a plurality of radiating devices arranged in parallel and adapted to be fed I generator, a modulating frequency generatorfrom said bus-bars, independent modulating means for each radiating device, and means associated with each radiating device for regulating its power output and preserving vat'the same time the tuning thereof.

'8. In a multiplex system-of transmission,

the combination with a high frequency generator, of a plurality of radiating devices adapted to be fed from said generator, one of said radiating devices being adapted to transmit the fundamental frequency of said associated with each of the remaining radiating devices, said radiating devices includ- 1 ing means to transmit respectively the sum and difference of the frequencies of the high frequency generator and a the corresponding modulating frequency generator, and separate means for regulating the power output of each radiating device 'at the same time preserving the tuning thereof. 7

9. In a radio signaling system, a high freing each of said devices to the sum or differ. ence frequencies of the alternator and the corresponding modulating means. I 10. In a radio signaling system, a high frequency alternator, a plurality of intermediate circuits associated with the output of said main alternator, a radiating circuit coupled to each of said intermediate circuits, inde f one of said coupling means comprising a circuit including a direct current generator in series with a plurality of transformer secondary windings, anda pair of 1ron' core 1mpedances, a pair of inductances coupled to inductances in series with one of said radiating c rcuits, a connection between the positive terminal of sald direct current generator and one of said bus bars, an inductance connecting a point between said ironv core impendances to the other bus bar, a modulating frequency generator connecting the primary windings of said transformers in series, and means for controlling the output of the direct current generator.

HENRI CHIREIX.

quency alternator, a plurality of radiating devices arranged to be fed from said alternator, modulating means associated with each of said radiating devices, and means for tun- 

